ioquatix/utopia-websocket

# Copyright, 2015, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require "utopia/websocket/version"
require 'websocket/driver'

module Utopia
    def self.WebSocket?(env)
        ::WebSocket::Driver.websocket?(env)
    end
    
    module WebSocket
        class Connection
            READ_BUFFER_SIZE = 1024*8
            
            attr_reader :env, :url
            
            def initialize(env, io)
                @env = env
                @io = io
                
                scheme = Rack::Request.new(env).ssl? ? 'wss:' : 'ws:'
                @url = scheme + '//' + env['HTTP_HOST'] + env['REQUEST_URI']
                
                @driver = ::WebSocket::Driver.rack(self)
                @running = false
            end
            
            def write(string)
                @io.write(string)
            end
            
            def read
                @driver.parse(@io.readpartial(READ_BUFFER_SIZE))
            end
            
            def run(&handler)
                @running = true
                
                @driver.on(:close) do
                    @running = false
                end
                
                @driver.on(:open) do
                    yield @driver if block_given?
                end
                
                @driver.start
                
                while @running
                    self.read
                end
            ensure
                @io.close
            end
        end
        
        def self.open(env)
            if ::WebSocket::Driver.websocket?(env)
                env['rack.hijack'].call
                
                connection = Connection.new(env, env['rack.hijack_io'])
                
                connection.run do |driver|
                    yield driver
                end
            end
        end
    end
end